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Old 06-29-2022, 08:25 AM   #41
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So far going on a year with Tropi-Cool. It's still pristine white, and nothing has stuck to it or grown on it yet. Not everyone wants a silicon rubber roof, but as far as a paint the stuff is amazing. If I ain't dead I'll repost when I get ten years on it.
Did you make it this long and how's that roof? Lol

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Old 06-29-2022, 10:32 AM   #42
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Did you make it this long and how's that roof? Lol
My calculations say its only been 3 years so we have 7 more to go! Why not start with Rust-oleum and if you aren't happy then go with Tropi-Cool. From what I hear you can't do the opposite.
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Old 06-29-2022, 03:14 PM   #43
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A couple thoughts.

White is a no brainer for the color.

I was interested to read about IR heat through the windows, but there was not a lot of mention of heat transfer through the roof ribs, tho some people posted around it various times, and one specifically addressed it by putting 3/4” insulation inside below the ribs. Another mentioned the hot weather busses that had an air gap for shade.

I find this both interesting and challenging.

The air gap method is a hot weather winner! The trouble is that it provides 0 benefit in cold (by itself).

Addressing the inside with 3/4” foam board is good, and it doesn’t kill a lot of headroom. But seems a shame to insulate the roof with foam board thickness that is greater than the gain because of the loss from heat transfer from the ribs. Adding 3/4” is far from the 2” between ribs. Hopefully that makes sense as less than ideal. Perhaps somewhere to the left of the decimal point, but if and how far we do not know.

Ideally the insulation would be above the roof so that there is negligible heat, or cold transfer (gain/loss). That way all the insulation inside would be less affected by heat or cold from exposure to sun or cold.

Lots of comments dealt with paint insulation (but paint is not thick enough to insulate as mentioned) and reflectivity, but the cold that creeps in through transfer seems like a big deal too. From an efficiency standpoint, but practically it may be cheaper and easier to overcome with a heater.

It seems that 1/2” of insulation above the steel roof would significantly reduce the transfer of heat to the ribs, while adding some protection from cold. And the more the greater.

I was a member of the Foamie camper group before this, and it seems like foam on the roof covered with (PMF poor man’s fiberglass) over two or 3 layers of 1/4” poly packing foam, would contour and glue down easily.

The foam has a decent enough R value, and it is available in 1/4” X 4’ x 50’ rolls.

I see issues, but they are overcome able and it is fun enough to think about and bounce off of the group.
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Old 09-06-2022, 10:11 AM   #44
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Do you recommend using a sealer underneath first?
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Old 09-06-2022, 11:38 AM   #45
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I was interested to read about IR heat through the windows, but there was not a lot of mention of heat transfer through the roof ribs, tho some people posted around it various times, and one specifically addressed it by putting 3/4” insulation inside below the ribs. Another mentioned the hot weather busses that had an air gap for shade.
We used a combination of cavity fill between the ribs, and continuous insulation over the top, in both the ceiling and walls. We also did the same for the floor... Cavity fill between the sleepers and a layer of polyiso over the top of them.
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Old 09-06-2022, 12:05 PM   #46
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I know stuff's bad right now, with all that starving BS. And the dust storms. And we're running out of french fries & burrito coverings. But I've got a solution!



Problem?? Whats the solution?
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Old 09-06-2022, 01:49 PM   #47
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Problem?? Whats the solution?
I'm Not Sure


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Old 09-06-2022, 02:37 PM   #48
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Hi. Me again. Recommending no one use any elastomeric coating. I regret doing it.
Fix your leaks properly and paint whatever color you wish with automotive or tractor paint. Move on to the next project.
I’m near Dallas and have a few questions
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Old 09-06-2022, 05:27 PM   #49
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I saw (from a distance) a really nice motorhome for sale last week. Then (from a distance) I saw the dirty, grey roof covering that was peeling off the roof. Think I know what it was...
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